如果一棵樹倒在森林里，周圍沒有人聽見，它會發出聲音嗎？(If a tree falls in the forest, and nobody is around to hear it, does it make a sound?)——歐美最偉大的哲學問題

如果一棵樹倒在森林里，周圍沒有人聽見，它會發出聲音嗎？(If a tree falls in the forest, and nobody is around to hear it, does it make a sound?)——歐美最偉大的哲學問題在《歐美最偉大的哲學問題》中排名第19名。 ...

如果一棵樹倒在森林里周圍沒有人聽見它會發出聲音嗎歐美最偉大的哲學問題在歐美最偉大的哲學問題中排名第19名。

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我們精選了部分網友觀點：

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是的，當然有噪音。事實證明，噪音是由聲波產生的。振動通過物體或材料時會產生一種形式的能量。聲波是聲音撞擊材料或物體時產生的結果。聲音的頻率有很多級。人的耳朵能聽到特定范圍的聲音頻率。聲音本身或聲波也與音調、持續時間、響度有關，物體或物質的空間位置和音質。僅僅因為在某一時刻周圍沒有人能聽到這個聲音，這里的例子“如果一棵樹倒在森林里……”并不意味著聲波沒有產生或者能量不存在

Yes of course there's a noise. It's proven that noise is produced by soundwaves. Vibrations produces a form of energy when they pass trough an object or material. Waves are the result when the sound hits the the materials or objects. There are many levels of frequency in sound. Ears of humans can hear a specific range of sound frequency. The sound itself or soundwaves are also related to pitch, duration, loudness, spatial locotion and the sonic texture of the object or material. Just because there's no one around to hear this sound at a given moment ( the example here " if a tree falls in the forest... " ) doesn't mean that the soundwaves aren't produced or that the energy is non-existence.

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當然會發出聲音！所有移動的物體都會產生聲波，人類會聽到一些聲音，有些則不會，而有些動物會聽到人類聽不到的聲音。聲波最簡單的證明就是噴氣式飛機飛行速度超過音速時聽到的砰砰聲

Of course it makes a sound! Everything that moves creates soundwaves ( humans will hear some sounds and some not while some animals will hear sounds that humans don't hear ). The easiest prove of the soundwaves is the bang you hear when a jetplane goes faster than the speed of sound ( the soundbarrier )

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我喜歡這樣的問題。它讓你的大腦運轉起來，并引導你思考生活的其他方面。—英國女孩

I love questions such as this. It gets your brain working and leads you to think about other aspects of life. - Britgirl

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首先想想聲音是從哪里來的

Think first of where sound comes from first.

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取決于人的傲慢

Depends on the arrogance of the person